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- // Copyright (c) 2017 Uber Technologies, Inc.
- //
- // Licensed under the Apache License, Version 2.0 (the "License");
- // you may not use this file except in compliance with the License.
- // You may obtain a copy of the License at
- //
- // http://www.apache.org/licenses/LICENSE-2.0
- //
- // Unless required by applicable law or agreed to in writing, software
- // distributed under the License is distributed on an "AS IS" BASIS,
- // WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
- // See the License for the specific language governing permissions and
- // limitations under the License.
- package metrics
- import (
- "time"
- )
- // Timer accumulates observations about how long some operation took,
- // and also maintains a historgam of percentiles.
- type Timer interface {
- // Records the time passed in.
- Record(time.Duration)
- }
- // NullTimer timer that does nothing
- var NullTimer Timer = nullTimer{}
- type nullTimer struct{}
- func (nullTimer) Record(time.Duration) {}
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